scholarly journals Flexural‐isostatic reconstruction of the Western Mediterranean during the Messinian Salinity Crisis: Implications for water level and basin connectivity

2021 ◽  
Author(s):  
Hanneke Heida ◽  
Fadl Raad ◽  
Daniel Garcia‐Castellanos ◽  
Ivone Jiménez‐Munt ◽  
Agnès Maillard ◽  
...  
Keyword(s):  
Water Level ◽  
Western Mediterranean ◽  
Messinian Salinity Crisis

scholarly journals The Messinian Salinity Crisis as a trigger for high pore pressure development in the Western Mediterranean

2021 ◽  
Author(s):  
Michael S. Dale ◽  
Héctor Marín‐Moreno ◽  
Ismael Himar Falcon‐Suarez ◽  
Carlos Grattoni ◽  
Jonathan M. Bull ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Western Mediterranean ◽  
Messinian Salinity Crisis ◽  
Pressure Development

Refining our knowledge of the Messinian salinity crisis records in the offshore domain through multi-site seismic analysis

2011 ◽  
Vol 182 (2) ◽  
pp. 163-180 ◽  
Author(s):  
Johanna Lofi ◽  
Françoise Sage ◽  
Jacques Déverchère ◽  
Lies Loncke ◽  
Agnès Maillard ◽  
...  
Keyword(s):  
Seismic Analysis ◽  
Early Stage ◽  
Continuous Process ◽  
Western Mediterranean ◽  
Messinian Salinity Crisis ◽  
Seismic Profiles ◽  
Base Level ◽  
The Mediterranean ◽  
Spatio Temporal ◽  
Depositional Units

Abstract The Messinian salinity crisis (MSC) [Hsü et al., 1973] has deeply shaped the Mediterranean landscape and triggered large sedimentary deposits (evaporites and clastics) in the deep basins within a short time span. Until recently, the MSC has mainly been analyzed independently, either through outcrops located onshore (e.g. Morocco, Cyprus, Spain, Sardinia, Italy) or through marine seismic profiles in the deep offshore. Each approach bears its own limitations: (1) on the one hand, land outcrops refer to incomplete Messinian successions that are geometrically disconnected from the offshore Messinian deposits owing to tectonics (e.g. Apennines) and/or because they accumulated at an early stage of the crisis in shallow marginal basins (e.g. Spain); (2) on the other hand, seismic profiles from the upper margins down to the deep basins allow to image and explore the entire MSC event as a continuous process, but with a lower resolution and with a lack of stratigraphical and lithological control, in the absence of full recovery of scientific boreholes. We present here a synthesis of a set of modern geophysical data over the Mediterranean and Black seas allowing to image the Messinian markers (erosion surfaces, depositional units and their bounding surfaces) much better than previously and to study the spatio-temporal organisation of these markers from the inner-shelves down to the bathyal plains. The results from thirteen areas located offshore are compared, with common charts and nomenclatures. The comparative and multi-site approach developed here allows to analyse the record of the MSC on margin segments and basins that depict various structural, geodynamical and geological settings, to fix a number of local influencing factors (tectonics, subsidence, inherited topography, sedimentary fluxes...) and to partly assess their influence in facies and geometrical variations of the MSC units. We are thus able to extract from our analysis some recurrent signals related to the MSC ss., allowing us to discuss: (1) the amplitude and modalities of base-level changes during the MSC; (2) the depositional modalities of the MSC units in the deep basins; (3) the location of the erosion product of the margins and to emphasise (4) the major differences between the eastern and western Mediterranean basins.

Image improvement of Late Miocene (Messinian) to Plio-Quaternary units in the Algero-Balearic basin

2020 ◽  
Author(s):  
Simon Blondel ◽  
Fadl Raad ◽  
Angelo Camerlenghi ◽  
Johanna Lofi ◽  
Anna Del Ben
Keyword(s):  
Seismic Data ◽  
Early Stage ◽  
Complex Salt ◽  
Western Mediterranean ◽  
Seismic Facies ◽  
Messinian Salinity Crisis ◽  
Transform Fault ◽  
The South ◽  
Seismic Reflection Data ◽  
Multichannel Seismic Data

<p>This study intends to contribute to the understanding of the Mediterranean Salt Giant in the Western Mediterranean, formed about 6 Ma ago during the Messinian Salinity Crisis. It provides reprocessed multichannel seismic reflection data that aim at improving our knowledge of the stratigraphy in the Algero-Balearic deepwater basin and its continental margins, in the absence of lithological information from wells.</p><p>We investigate the seismic expression of the Messinian salinity crisis from the south-east of the Balearic promontory to the central Algero-Balearic abyssal basin and the salt tectonic processes associated to these facies. Here the segmentation of salt structures has been previously described using shallow chirp sonar data, low-resolution vintage multichannel seismic data and high-resolution multi-channel seismic data post-stack migrated with a constant velocity field. The structure of the northern Algero-Balearic basin is controlled by two abrupt fault scarps oriented SW–NE (mainly the Emile Baudot Escarpment transform fault) and WSW-ENE (mainly the Mazarron Escarpment transform fault) emplaced during the basin extension, and later intruded by steep and narrow volcanic ridges of Pleistocene age. It is a good analogue to early stage salt tectonic for older and more complex salt giants in the North Sea or the Gulf of Mexico.</p><p>We reprocessed 2D Kirchhoff PSTM multichannel seismic data acquired by the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale – OGS (SBALDEEP Cruise of 2005 and SALTFLU cruise of 2012; the latter within a Eurofleet cruise) spanning the South-East continental margin of the Balearic islands and the Algero-Balearic basin. The reprocessing was designed for improving the continuity of the reflectors by applying Kirchhoff PSTM using a detailed velocity model, while preserving amplitude information. The objectives are to better apprehend the structural complexity of the area and to retrieve the amplitude variation within the Messinian units, in an attempt to derive the composition of the salt and the pressure regime.</p><p>We present preliminary results where we delineate four different domains based on i) the seismic facies, ii) the amount of salt deformation, iii) the thickness of the overburden and iv) the pre-salt configuration. We try to assess the presence of the Messinian trilogy in the south-eastern continental slope. We attempt to reconstitute the paleo-depositionnal environment of the various depositional units, and the effect of crustal structures and salt tectonic gravity spreading and gliding on their syn to post-depositional evolution. Finally, we search for evidence of fluid circulation within the Messinian and the Plio-Quaternary deposits over the study area.</p>

The end of the Messinian Salinity Crisis in the western Mediterranean: Insights from the carbonate platforms of south-eastern Spain

2010 ◽  
Vol 229 (4) ◽  
pp. 224-253 ◽  
Author(s):  
Raphaël Bourillot ◽  
Emmanuelle Vennin ◽  
Jean-Marie Rouchy ◽  
Marie-Madeleine Blanc-Valleron ◽  
Antonio Caruso ◽  
...  
Keyword(s):  
Western Mediterranean ◽  
Messinian Salinity Crisis ◽  
Carbonate Platforms ◽  
South Eastern

scholarly journals Sedimentological and paleoenvironmental scenario before, during, and after the Messinian Salinity Crisis: The San Miguel de Salinas composite section (western Mediterranean)

2016 ◽  
Vol 379 ◽  
pp. 246-266 ◽  
Author(s):  
Hugo Corbí ◽  
Jesús M. Soria ◽  
Carlos Lancis ◽  
Alice Giannetti ◽  
José E. Tent-Manclús ◽  
...  
Keyword(s):  
Western Mediterranean ◽  
Messinian Salinity Crisis ◽  
Composite Section

Erosion of continental margins in the Western Mediterranean due to sea-level stagnancy during the Messinian Salinity Crisis

2010 ◽  
Vol 31 (1) ◽  
pp. 51-64 ◽  
Author(s):  
Janna Just ◽  
Christian Hübscher ◽  
Christian Betzler ◽  
Thomas Lüdmann ◽  
Klaus Reicherter
Keyword(s):  
Sea Level ◽  
Western Mediterranean ◽  
Continental Margins ◽  
Messinian Salinity Crisis

scholarly journals Phylogeny of the genus Percus (Coleoptera: Carabidae) – nuclear genes and the basal splits

2006 ◽  
Vol 17 (3) ◽  
Author(s):  
Martina Brückner ◽  
Dietrich Mossakowski
Keyword(s):  
Iberian Peninsula ◽  
Dna Sequences ◽  
Maximum Likelihood Method ◽  
Western Mediterranean ◽  
Balearic Islands ◽  
Likelihood Method ◽  
Rrna Gene ◽  
28S Rrna ◽  
Messinian Salinity Crisis ◽  
The Third

The phylogeny of the western Mediterranean genus Percus s.l. (Coleoptera, Carabidae) was analysed using partial DNA sequences of the nuclear 28S rRNA gene (865 bp). All 18 species of Percus s.l. with exception of P. espagnoli from the Balearic Islands were included. Phylogenetic analysis using the Maximum likelihood method reveals that the genus splits into three groups. The French Percus villai stands on its own. The Tyrrhenian species of Corsica, Sardinia, Sicily and the Italian mainland form the second group. Within this group, the phylogenetic relationships are not resolved. The third group includes Percus plicatus from Mallorca and the species of the subgenus Pseudopercus from the Iberian Peninsula. These results indicate that the subgenus Percus s.str. is paraphyletic. The split of Pseudopercus and P. plicatus probably occurred with the separation of the Balearic islands from the Iberian peninsula (20million years ago) or by the flooding of the Mediterranean after the Messinian salinity crisis (5.3 million years ago). Based on these assumptions, the divergence rate of the 28S gene can be estimated as being at 0.22–0.27% or at 0.99–1.01% per million years.

The sedimentary markers of the Messinian salinity crisis and their relation with salt tectonics on the Provençal margin (western Mediterranean): results from the “MAURESC” cruise

2011 ◽  
Vol 182 (2) ◽  
pp. 181-196 ◽  
Author(s):  
Edda Marlène Obone-Zue-Obame ◽  
Virginie Gaullier ◽  
Françoise Sage ◽  
Agnès Maillard ◽  
Johanna Lofi ◽  
...  
Keyword(s):  
Sedimentary Cover ◽  
Close Relation ◽  
Western Mediterranean ◽  
Seismic Facies ◽  
Normal Faults ◽  
Salt Tectonics ◽  
Messinian Salinity Crisis ◽  
Deep Basin ◽  
Seismic Reflection Data ◽  
Reflection Data

Abstract The Messinian salinity crisis (MSC) is characterized by gigantic erosion that remodels the margins while a thick, essentially evaporitic and detrital, sedimentary sequence forms in the deep basins. Based on recent (MAURESC, 2003) and earlier (MESEA 1, 1990; MAGIRAA, 1996; GEOBREST, 2002) seismic reflection data, this work brings to light the record of the MSC on the Provençal margin, which has until now been rarely explored from this perspective. Beyond its strictly regional interest, this study fits into a larger synthesis of MSC seismic markers in the Mediterranean and Black Sea marine domain [Lofi et al., 2011] and employs the new nomenclature established on this occasion. The results obtained reveal a Messinian detrital body (CU unit) of 625 metres maximum thickness at the foot of the margin, accumulating at the mouths of the principal canyons. Its form, facies and extension assimilate it to clastic fans, fed by subaerial erosion linked to the MSC. The relative geometry of CU and the Messinian units MU and UU deposited in the deep basin give indications to their chronostratigraphic relations. The deposition of the CU unit is posterior to the basal part of the mobile unit consisting of halite (MU), but contemporary to its top. These results agree with the recent scenarii, which propose that the precipitation of MU in the basin began early, during the lowering of the sea level, and ended at a low level during the MSC [Blanc, 2000; Martin et al., 2001; Sage et al., 2005; Ryan, 2009]. The UU unit surmounts MU and is subdivided into two sub-units with perceptibly different seismic facies : UU1 at the base and UU2 at the summit. UU1 could correspond to a unit containing more halite and/or more clastic material than UU2. The UU1 sub-unit could be partially contemporary to the CU unit. Concerning salt tectonics and its markers, three structural provinces have been evidenced in the sector of study, respectively : an upslope domain in extension (normal faults), an intermediary domain in translation (tabular MU) and a downslope domain in contraction (salt diapirs). These domains are directly linked to the gravity spreading and/or gliding of the brittle sedimentary cover formed by the CU, UU and Plio-Quatenary units and of the mobile level, MU. In the study area, a close relation between the distribution and thickness of CU and salt tectonics has additionally been evidenced at the mouths of the large Messinian canyons, being best expressed where CU is thick.

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